static gboolean
gst_type_find_element_activate_sink_mode (GstPad * pad, GstObject * parent,
GstPadMode mode, gboolean active)
{
gboolean res;
GstTypeFindElement *typefind;
typefind = GST_TYPE_FIND_ELEMENT (parent);
switch (mode) {
case GST_PAD_MODE_PULL:
if (active) {
gst_segment_init (&typefind->segment, GST_FORMAT_BYTES);
typefind->need_segment = TRUE;
typefind->need_stream_start = TRUE;
typefind->offset = 0;
res = TRUE;
} else {
res = gst_pad_stop_task (pad);
}
break;
case GST_PAD_MODE_PUSH:
if (active)
start_typefinding (typefind);
else
stop_typefinding (typefind);
res = TRUE;
break;
default:
res = FALSE;
break;
}
return res;
}
static gboolean
gst_type_find_element_activate (GstPad * pad)
{
// set state machine, and caps to NULL
start_typefinding (typefind);
{
gst_pad_set_caps (typefind->src, NULL);
gst_caps_replace (&typefind->caps, NULL);
typefind->mode = MODE_TYPEFIND;
}
}
static gboolean
gst_type_find_element_activate (GstPad * pad)
{
GstTypeFindProbability probability = 0;
GstCaps *found_caps = NULL;
GstTypeFindElement *typefind;
typefind = GST_TYPE_FIND_ELEMENT (GST_OBJECT_PARENT (pad));
/* if we have force caps, use those */
if (typefind->force_caps) {
found_caps = gst_caps_ref (typefind->force_caps);
probability = GST_TYPE_FIND_MAXIMUM;
goto done;
}
/* 1. try to activate in pull mode. if not, switch to push and succeed.
2. try to pull type find.
3. deactivate pull mode.
4. src pad might have been activated push by the state change. deactivate.
5. if we didn't find any caps, try getting the uri extension by doing an uri
query.
6. if we didn't find any caps, fail.
7. emit have-type; maybe the app connected the source pad to something.
8. if the sink pad is activated, we are in pull mode. succeed.
otherwise activate both pads in push mode and succeed.
*/
/* 1 */
if (!gst_pad_check_pull_range (pad) || !gst_pad_activate_pull (pad, TRUE)) {
start_typefinding (typefind);
return gst_pad_activate_push (pad, TRUE);
}
/* 2 */
{
GstPad *peer;
peer = gst_pad_get_peer (pad);
if (peer) {
gint64 size;
GstFormat format = GST_FORMAT_BYTES;
if (!gst_pad_query_duration (peer, &format, &size)) {
GST_WARNING_OBJECT (typefind, "Could not query upstream length!");
gst_object_unref (peer);
return FALSE;
}
/* the size if 0, we cannot continue */
if (size == 0) {
/* keep message in sync with message in sink event handler */
GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND,
(_("Stream contains no data.")), ("Can't typefind empty stream"));
gst_object_unref (peer);
return FALSE;
}
found_caps = gst_type_find_helper_get_range (GST_OBJECT_CAST (peer),
(GstTypeFindHelperGetRangeFunction) (GST_PAD_GETRANGEFUNC (peer)),
(guint64) size, &probability);
gst_object_unref (peer);
}
}
/* 3 */
gst_pad_activate_pull (pad, FALSE);
/* 4 */
gst_pad_activate_push (typefind->src, FALSE);
/* 5 */
if (!found_caps || probability < typefind->min_probability) {
found_caps = gst_type_find_guess_by_extension (typefind, pad, &probability);
}
/* 6 */
if (!found_caps || probability < typefind->min_probability) {
GST_ELEMENT_ERROR (typefind, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
gst_caps_replace (&found_caps, NULL);
return FALSE;
}
done:
/* 7 */
g_signal_emit (typefind, gst_type_find_element_signals[HAVE_TYPE],
0, probability, found_caps);
gst_caps_unref (found_caps);
typefind->mode = MODE_NORMAL;
/* 8 */
if (gst_pad_is_active (pad))
return TRUE;
else {
gboolean ret;
ret = gst_pad_activate_push (typefind->src, TRUE);
ret &= gst_pad_activate_push (pad, TRUE);
return ret;
}
}
